package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点（判定条件在那个类及其方法使用
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}
    /**
     * 通知的位置
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        /**
         * 调用方法
         */
        log.info("执行AutoFill注解中.......");
         MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        final AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得那个有AutoFill方法的注解
        final OperationType operationType = autoFill.value();//获得数据库操作类型：Insert或者Update
        final Object[] args = joinPoint.getArgs();
        //如果判定获取实体为空则退回
        if (args == null || args.length == 0) {
            return;
        }
        final Object entity = args[0];
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        if (operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
